How to Scan A QR code with Facebook and Twitter App?

What is QR code?   “QR code (abbreviated from Quick Response Code) is the trademark for a type of matrix barcode (or two-dimensional barcode) first designed in 1994 for the automotive industry in Japan. A barcode is a machine-readable optical label that contains information about the item to which it is attached. A QR

But at present, the browser does not support to scan the QR Code. Sometimes, that's a little inconvenient. And download a QR scanner APP? That's a method, but ...

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